Question

Arrange the different regions of a flame in increasing order of temperature.

• A. Middle region < inner region < outermost region
• B. Inner region < middle region < outermost region
• C. Inner region < outermost region < middle region
• D. Outermost region < inner region < middle region​

Answer 1

The correct option is B

Inner region < middle region < outermost region

The inner region of a flame mostly has vapourised wax and very little burning takes place there, so its temperature is lowest. The middle region undergoes partial burning and therefore has an intermediate temperature. The outermost region gets maximum oxygen supply and complete combustion takes place. So, the temperature is maximum in the outermost region.